<scp>Entropy‐stabilized metal‐CeO_<i>x</i></scp> solid solutions for catalytic combustion of volatile organic compounds

Abstract

Abstract Doped Ceria with abundant oxygen vacancies exhibits enhanced performance in heterogeneous oxidation. In principle, doping 50 mol% divalent cations (such as: Cu 2+ , Zn 2+ , and Mg 2+ ) into CeO 2 lattice would produce an exceptional catalyst with maximum active oxygen species. However, the huge size gap between Ce (IV) and divalent metal cations obstructs its synthesis. Here, we utilize the theory of increasing configurational entropy with five metal dopants to lower the Gibbs‐free energy, and successfully incorporate 50 mol% divalent metal cations into CeO 2 lattice. This unique doping environment endows Ce 0.5 Zn 0.1 Co 0.1 Mg 0.1 Ni 0.1 Cu 0.1 O x two features: (a) Abundant active oxygen species for excellent performance in volatile organic compounds catalytic oxidation; (b) Bring multi reactive sites, which enable the simultaneous combustion of carbon monoxide, propylene and toluene. Moreover, the increased entropy value makes Ce 0.5 Zn 0.1 Co 0.1 Mg 0.1 Ni 0.1 Cu 0.1 O x an ultra‐stable catalyst in both thermal and hydrothermal conditions (e.g., Working &gt;200 hr in water‐resistance experiment).